my plug was white....

[raptor446]

look what I found the guy who tuned my bike said he'd hook me up with some free jets sense it dies out on top end sometimes and the plug is way too white...well I pulled it and its a 250 main jet.....are jets on mikuni's that much bigger you guys are putting like 155's in your bikes right? lol guess I'm gonna have to go with 260, 270 or 280?

let me know what you guys think

 

[DeathShadow]

What grade of fuel do you use? That plug could be like that due to pre-ignition and not a main jet problem. You should be running around a 80% Race fuel/20% Super mix depending on what works best.